That seems to have been just Matrix the website, not Matrix the thing.

Yeah, their website and surrounding infrastructure (build servers, distribution nodes, and partly the matrix.org HS) got hacked due to a publicly accessible Jenkins server and some insecure SSH settings.

Amusingly enough, while all this was happening, the only noticeable effect on the Matrix network was that the Matrix.org-hosted IRC and Gitter rooms became silent. And the network also ran a bit quicker, as federation didn't have to talk to the overloaded Matrix.org HS any more.

I personally respect how well they dealt with the security issue, and how open they were with why it was possible for it to happen in the first place.

Sure. Also, while we're on the not-yelling, let's change all of our camel-case variable names to lowercase, because it's much more calming to read thevariablethatgovernswhetherornotwedothethingthatweonlydosometimes when there are no word boundaries being yelled.